I would like a monthly/weekly bonus based as a percentage of loss (sort of rakeback)
well that seems to be the most requested bonus because this is something fair for me as well, imagine losing 10k wager and you will be given at least 5-10% of rake back? or even 2% is good enough for me if I wager good in my weekly gaming.
but also if there is a deposit bonuses then it much better having those 2 bonuses offered.
If casinos could agree to this kind of rake back bonus it would have been better, but I don't think so because gamblers will always abuse it and take it for their right to be given, but this is something intended as promo and not their mandatory responsibility to give back to every lost accunted for on a big loss, but there could be certain conditions they can implement for a gambler to have been actively using their casino over a year, gambles more than 10 times a month and have a specific amount that must have been involved as losses just as you've mentioned, this will be a good idea if gamblers can maintain the whole process involved.
At least the casinos will have ways to protect the bonuses that will be given to gamblers so that fraudulent gamblers do not use them for these gamblers.
And before the casino gives the promo, the casino team must have prepared it well so that if something happens outside their plans, they can handle it by always maintaining their casino.
Gamblers who always want a bonus every week or month will try to get it even though they have to meet the requirements.
They are making ways to find cheaters mate , I know that those bonuses given are being detected once cheater tries to take the advantage and besides they have powers to stop this for all reason at all time so maybe lets take it out for now .
Promotions are created solely not for any other gain but to favor the site so they will not allow those to hinder their capacity to take the money out of our pocket.