The main motivation behind kesuba and a large party is for the hatan to take the wedding seriously and not, h’v, be ready to change his mind and divorce first time kallah burns his porridge. So, _hatan_ spending some serious money on the process is OK. 200 zuz is an bligatory amount, at some point bnei kohanim asked for 400. Whatever the market will bear. But there no reason for kallah to do that.
On the other hand, we mentioned before about cheap medieval weddings. Turns out, in 1930 Mir yeshiva, they also had weddings 2 hours before shabbos, then close relatives having a shabbos dinner, and then whole community coming for sheva brochos (just the brochos, not food).