I wouldn't do it.
In general, pitchers are a poor investment choice, they almost never achieve the popularity of hitters and their cards fall behind. Greinke is shaping up to reach the Hall, but he will make it with a compiler reputation (2009 and 2015 are not getting him in) who played for several times and split his prime among several teams, none of which he is identified strongly with. Greinke is a poor investment; there are not many Greinke fans, his hall election will not be a surprise but it also won't be a top tier. He's going in with Niekro and Perry, not Maddux and Pedro as the best of the best. Even the absolute best pitchers don't usually make for good investments, nothing going for Greinke seems to indicate he would break the trends.
If one collects, one will have one. If one invests, one may make money. If one tries to collect and invest at the same time, usually one doesn't end up having a lot of fun or making much money. I'd collect Greinke because you like Greinke, or invest in something more likely to produce a safe return.
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