I have heared of some people that using more than 1 link in your signature in a forum is not so good for seo!

When i mean more than 1 links, i mean it like that:
ex. kw1--->yourdomain/page1
kw2--->yourdomain/page2

Its better to have 1 link only, or it doesnt matter to have more?

Please help cause i want to buy backlinks and i want to know if its more cool to use 1 keyword or more!