changing links on old freesites?

[Babagirls]

first, let me say hi (this is my first post here ) anyways, i have a couple questions...

i have a freesite thats getting some MAJOR se traffic. i submitted this freesite to linklists about a year ago.

now, my problem is, the pills sponser i use is shaving (i always thought that, and it was talked about on another board).

so, im potentially missing some great pills sales.

if i went and changed ONLY the link to a new pill sponser, will that get me blacklisted?? normally, i wouldnt touch it, but this particualar freesite is getting MAJOR se traffic (it has the #1, #2 AND #3 spot for 2 specific keywords on yahoo).

also, would that affect my ranking in yahoo if i changed it??

Thanks in advanced!!
~Baba~