No question that it's better to have disposable income and the more the better for baseball recruiting.
But, I know of several HS guys who parlayed work into all each needed. Several caught at our PCs BackYard; in exchange for all he offered (lessons, games, physical training, contacts) they caught the lessons. And they learned an awful lot about pitching in the process. Other guys worked at the local batting cage where they exchanged time for time, lessons, and connections. They learned alot about batting.
The HS working path isn't easy, but I know of more than a few who went that route.