Question about proxies

I'm looking to start a gold farm and I have a question on how they work. Let's say I buy a proxy for around $5. I use that proxy to create an account and bot. What if that bot gets banned? now my ip is potentially flagged for that proxy. does this mean i'll have to buy another proxy just for another bot on a different ip? I know some proxies get an ip-change per month but I can't be bothered waiting for that long just for a new account on a new ip.

 

If only one account gets banned on that proxy the chances of it being flagged are minimal/non existent as much as I know.
But if you wanna feel uber safe I suppose you could ask your proxy provider to change the proxy for your.