Understand. So you're trying to figure out how you're assigned or given your offers? Honestly, I don't think Boy themselves even know. Boy'd loyalty program has been all over the place lately. I think their site was down for days maybe like 2-3 weeks ago? It was due to several things. Maintenance and update to their system, and integration of new players from MyChoice (I believe they purchased some properties). Since then, many users have complained about issues relating to their account, tier points, tier status, etc. People reported tier points being removed/added, statuses being upgraded/downgraded It's a total mess. Just this week I think members received a email notification that their member number was going to change (2 additional numbers added to your current one). So, in short, your offers going away may or may not have to do with the mess that's going on with Boyd/Bconnected right now. No sure way to tell. Can always contact them if you noticed anything different or off from your account.
Another reason maybe is when you got the offers, your play was at a higher level. The system and offers finally caught up with your play and adjusted it accordingly.
I know the info probably doesn't answer your specific question related to how their system works. I don't think anyone can give you precise information. Even with enough data points, analyzing and comparing just gives general idea of what people get with what kind of play. But one thing is for sure, offers are closely and definitely tied to play. That's the case across any and every gaming loyalty program.