Has anyone experienced a VP session where you give a lot of coin-in and lose a fair bit, yet the casino quickly sends you pathetically small mailers in relation to the action?

I waited a couple months and the offers improved markedy (5x larger freeplay bounceback vouchers) because I decided to go to other casinos for a while, instead. Most likely it was due to my not triggering the smaller offers sent to me right after I played.

My question is: Should I continue waiting for even bigger bounceback freeplay vouchers in the months ahead with the risk of their sliding back to nothing anyway if I don't go this month?

I know all casino chains operate differently with their marketing mailer algo's, but I was curious as to what other players' experiences were in this area. Thanks!