Ask HN: Where to put my product: marketplaces or bootstrapped startup?

Long story short: I am working on an appointment/scheduler project that can be used in various industries with very small tweaks (tennis courts, dog daycare, conference room schedule, doctors...basically anything that needs an online scheduler).

Last night I dug more on "my competitors" and saw that some of them never took off, they have no clients, even thought their product looks and works like a charm.

So...should I upload my product to code marketplaces (eg. codecanyon) for a reasonable price ($15-20) or try to run it as a bootstrapped startup and see if it gets traction?