Most of these new sites open with a no deposit for a few players then we who get it pass it on too our fellow gamblers in forums and its a free for all and they get all freaked out with the bombarding of the requests.
This perhaps is what I am referring to. If I am looking at it from their point of view, that of getting paying customers to deposit instead of freaking out I would be rubbing My hands in anticipation. Simple statistics are going to show me 1 in ten of these "visitors" will be depositing with me... IF their experience is satisfactory. Maybe not today but My place will be on the tip of their tongues... and wallets when they are getting ready to deposit.
Face it, with the playthrough requirements on free chips barely 1 in 500 will hit that playthrough... and that one will Rave about how good that casino was. Yes, the 1 guy who cashes in for 50$ will probably redeposit that 50 right back... plus some of his own... but it is that other 499 I would be wanting to market towards in the hopes of getting them to reach into their wallets as well.
A hypothetical scenario ~ Jimbeaux cashes in a free $25 dollar chip and sits loads his first machine. A pop up from live chat opens and says "Hello Jimbeaux, we hope you enjoy the free chip but are sorry to inform you that unfortunatly you have inadvertantly (sic) used a second free chip in a row which unfortunatly will not allow you to claim any winnings should you get lucky tonight. Please feel free to continue playing that chip just for fun tonight... or if you wish to make a minimum deposit of 30 dollars we will void this chip and give you a brand new one for the same amount... to use at your leisure...~
What are odd's that I can talk just 2 out of ten into that? Do you have any idea how many people it took to "exceed the bandwidth"? If 2 out of ten of those visitors became depositors The take would have been through the roof.
The best thing to do as far as depositing is DO NOT take the bonus unless it is a no restriction bonus, we all like the extra "bang for the buck" but the playthrough on most coupons is just crazy, i have never gotten 2-1 or better when i put my $$ on blackjack table at a land casino and then hear them say"if you want to win you need to play it 20 times over". The h*** with that. If its a freechip then i will live with there terms.
Sportsbookers are a strange breed, odds run through their heads at all times. But you are right. If you stick to your own money then you have no limits on how much you can win or when you can withdraw. Both attractive reasons to avoid playthroughs entirely. On the other hand, as the house, the longer you stay at the table the more the odds sit with me, so those 'bonuses" work to my benefit... as long as I don't make the playthrough impossible. I want Winners, some at least because Winners cause Excitement and Envy as others try to become winners as well.
Now me, I have thirty bucks as a stake. We have all played enough thirty dollar chips to realize that building that thirty to anything of value is going to be darn tough, just because a single bad run of the reels can wipe it out before you ever get a chance to recover. On the other hand having 60 added to my stake, at the cost of playing through 900 dollars worth of spins... you know... that is within the realms, tough but not impossible... and the added cushion does increase my odds of being able to ride over the bad runs.
I can't compare these online places to landbased... the analogy does not come close. what you proposed for the landbased blackjack table would not ever work... But free drinks, meals, rooms and other landbased perks would not be effective in the online market either. It's their house... you play by their rules... that is universal.
On the same note you would never whine in a landbased casino that "it was not fair, you did not know the rules" and expect any sympathy.