I support this and I don't at the same time because it doesn't solve the inherent problem with natural farming incentives. Whips aren't the most efficient thing to use training points on, dragon boots are. Therefore, unless we're going to change all the items in the training shop, that can be used on the upgrade chest, I don't see a point. If anything, upgrades for higher tier gear should be more expensive, but also give more gems for failures (gear upgrades are a 1:4 ratio for gem output). Right now the most efficient farming method for gems is lower tier gear because they give a disproportionate amount of gems compared to higher tier gear.
Dragon boots give 1 gem
primal weapons give 15 gems
Do you think it takes 15x more effort to get a primal than it does to get dragon boots? or are dragon boots 15x less valuable than primal weapons?