Level 435 5*, good enough? Worth 720 cp to get to level 450?

RemoDestroyer

At least for pvp, once you break into the 5* mmr i feel there are enough championed 5*s that even having one isn't going to give you much if any advantage but having 5*s at less than level 450 is a pretty big disadvantage. Am i very wrong?

Is it worth spending 720 or 1440 to finish off a level 435 or level 420 5*?

As a free to play player i think i somehow accumulate about 600 cp each month from event progression, champion level rewards, daily resupply and the odd alliance purchase. Probably means i play more mpq than i should.