If biochem didn't have reusables, what would be the point? You could just go with vendor consumables. Just saying..
For the EXACT same reason EVERY other class crafts.
1>To sell their products.
2>To craft their own products instead of buying them at retail prices.
Biochem breaks crafting, because they have access to an infinite pool of healing whereas everyone else has no such equivalency.
Instead of removing Biochem reusables I'd be 100% in support of EVERY crafting class getting an equivalent reusable. Time will tell if BW can make this happen.