How many people horde their rc's and what should i do

I'v noticed latley i want new trucks, currently i have a brushless rc18t, revo, and emaxx. i also have a jato 2.5 stinky nitro.
i now want a rock crawler and a 1/8th truggy, brushless of course.

when do most of you start selling trucks and what is the best way. should i try and trade for what i want or sell them and start buying, or horde them?

i am on the fence of what to do with the jato and e-maxx (keeping revo and rc18t)

any opinions or personal experience would help
thanks