Does this bear market affect the finances of the casino sites as well, so they have a low allocation for signature campaigns.
Not really imo. Crypto in the first place is simply a medium, I don't think it's volatility would be a huge thing for casinos since they still receive and reward strictly the same percent every time a player gambles (unless they reward the winners later, which doesn't happen afaik). I just think it's a matter of testing out the casino/campaign and looking at the results that it brings for that short amount of time.
Some of the old campaigns last long because they've either decided it was worth it for the long run, or with that short-term test they did decide that it would be worth the money and effort to continue doing it imo.
Is there even a specific price range matrix that campaigns should follow for us to determine if the allocation for the signature campaign is low or not?
I'd think it's dependent on the casino themselves, so it's different from each casino? A case-by-case basis so to speak. It also depends if they pay depending on rank, on number of posts, as well as the number of members they're willing to accept.