So many sr+ members applying for a member slot. If you're willing to accept $25 per week for your sr/hero sig, surely it makes better financial sense for signature campaign managers to keep you at this rate rather than bumping you to the next pay grade... After all, that's better bang per buck for Bustadice.
I suspect @yahoo62278 could save his employers a lot of money if he kept a log of the minimum rates each user would accept, particularly paying attention to those sr+ members looking to secure lower tier slots. Maybe such a system would curtail plans the play the long game, making it impossible for newer users to compete.
AFAICT, Yahoo usually go for users in the vacant rank first, and goes out that rank occasionally, perhaps when if doesn't find a suitable within the rank. That said I've been following Bustadice campaign for quite a while now It's not regular for user to get ranked up eg: finaleshot2016 has been Hero Member before joining in the campaign, but never got a chance to rank up until now (he got removed) Ralle14 also spent over 5 months receiving Sr Member pay before being able to move up to Hero Spot.
I'd say the reason for users willing to accept any pay is because of the longevity of the campaign, at least for me it is. The pay rate is also better than what most campaign tends to offer these days, so why not. I'd rather join $25 per week campaign which is bound(probably) to last for long term, than ~$40-50 paying campaign which would only last for a 2-3 weeks.