You need the VST anyway. Customers are going to ask for a "digital" version (VST) of your successful hardware synths. Arturia's VSTs are great and very popular for this reason.

So if you already have a VST, but you also have customers asking for actual hardware, why not slap your existing VST onto a Pi, and ship your "hardware" synth with this Pi inside? You end up supporting one software product across both lines.