I would tend to agree. 25 is very low as a max cap. I can understand them accumulating slowly and such, and them being rare to get. But due to all the costs involved, not being able to stock up even one unit's worth is kind of sad really. Especially after all the gold is spent to upgrade it to a level three center.
(Note: One of my characters exclusively uses SF, mainly because he's rich and funds their creation).
