what google want is that paid links have a rel=nofollow, they have no problem with you buying links, they want sellers not to use it to cheat on the serp's
then again ... as long you buy your links smart; from smaller, yet very related sites and you pay them to get a full page about you (as long the page is link from the homepage) then you get a high value link, while there's no way google can find out it has been paid for
just stay away from sites that have a lot of links on their homepage; then google knows those are paid links and won't give you any credit for it
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