Hi Terel :-) Welcome to the community.
Consider something like YouTube, which began as a simple idea and didn`t cost a whole lot of money to develop. With luck, marketing, and a good idea, the concept caught on. Then Google bought it.
Using the music industry for analogies, consider the way a band becomes famous. Today, the seemingly "typical" way is that the band records a demo, sends it to a Big Corporate recording company and hopes for a contract.
If the Big Corporate recording company takes the band, they make that band famous with marketing, promotion, concerts, and so forth.
But the other way that used to be the only way was for a band to go out and play. Anywhere! They`d play high schools, clubs, picnics, county fairs, or wherever else they could play. When they had enough money, they recorded a single record with 2 songs, one on each side. They sold that "single" direct to the public.
Many of those bands developed a tremendous following, and the recording companies then saw a clear and proven concept. Only at that point did the Big Corporate record companies come gathering around, offering contracts.
Technology is different from music, particularly with regard to patents and trade secrets. It`s also different in the amount of initial investment, making prototypes, and developing quantity inventories. But to address your question, I think it`s possible to sell direct to the public, even with technology.
If you really do have a great product, and there really is a market for it, then that`s why venture capitalists and outside investors exist.