The cap as it is is pretty standard for most boards I have seen, and additional storage is usually available in a tiered structure depending on how much some pays. I.e., basic membership is free, with 25 messages. Then there is something like bronz, silver and gold memberships with increasing numbers of perks dependant on a fee schedule. I don't know if Barry is interested in something that complicated, but it would certainly be worth some set donation to have 100-200 messages stored. I think a standard membership (as now exists) and an enhanced one (with more saved messages and such) would bring in a few more bucks to support the website.
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