Cost of a 3 tier set up.
 

I've been lucky.
I had a lot of plumbing bits knocking around I had other bits lying around I've tried to use what I already have.
I had to bay £32 for a poxy 18,000 btu burner!
But my full 3 tier system has cost me the grand total of £68

I have 8 kegs coming tomorrow. I was going to go for a 3 tier with 3 barrels but now amy thinking do I really need to go to all that extra effort?

Is it worth it?

Judging by the number of brews in your sig.... I say absolutely.