I would suggest you do a fine rush to max lvl on first 2 classes to participate in the server and end game. It takes literally 3 days max of questing (if u skip zones once u get appropriate lvl and after 54 u just follow morrok questline and after 92lvl u go to splitwater coast/moorlands), even less if you know what to do ( I did it in 2 days on one class). You can always have that fun on 3rd class.
Why?
I tried the same, but u can't supply yourself with diamonds unless you want to pay money, earning dias is reserved for max lvl chars where 99% of the people are, economy thrives on max lvl, not on old lvls.
In the end your choice, but keep that in mind.