Leos has a point, many of the listed skills already have existing pots out there that are better or at the same level. Unless you increase them those will probably not work out, but if you do increase the level there's a chance you'll ruin how some people earn income by brewing their own pots to sell.
If you choose to follow through with increasing the levels, would you consider setting a a different level cap for each tier of items? Common items 150, Rare, items 200, SE/LE 250, Crystal 300 Epic 400. These are just random numbers I'm throwing out there. Given if you make things too high, the pots for donations may become less useful. Personally I see the level caps to be a delicate thing.