I would agree its gross, if you didn't just heal it. If only the world were so simple that you get injected with someone's powers, then swallow a lump of gold and BAM, instant healing. Its worth the 'sharing of needles', IMO.
I guess that people would need to give written permission for this, but it all depends on whether or not you can reuse spikes. If you can't it gets a tad expensive, but worth the cost, especially if you have a Gold Compounder who is willing to be impaled every few hours. If he can heal back his powers.
New problem though. Now we need a Trueself (Feruchemical aluminum) to be spiked... but you could just heal it back with that compounded spike, so nevermind. If only Miles was not evil...
EDIT: I realize we've kind of hijacked your thread, Highprince. Do you want me to start a new one, or do you not mind? It is kind of related...