We are able to boost spells, barracks, and mines. Why not be able to boost war factory or building upgrades, BK, AQ . Unless your a whale and like to spend 3000 gems on a specific upgrade than I guess it caters to that croud. But for the people that by the 25 buck or 50 buck cards every month or so. I could see people boosting these things. for instance spend for example, 100 to 250 gems to speed up the process is o.k. for the minor spenders like u. So instead of waiting 14 days for a golum upgrade u can get it done in 8 days with a 100 TO 250 gem boost. for example. Sc would gain more profits from the minor spenders if they allowed this option.