I didn't think I'd have to explain it but here it goes,
For the share price to go up, a lot of shares have to get purchased and held. This requires a lot of capital.
while retail investors have a lot of money, the big bucks are in institutional investors and super funds, almost all of which only invest in respectable companies.
one way a company can gain respectability in the eyes of institutional investors is to pay a regular dividend.
institutional investors will invest in a company that doesn't pay dividends but it helps if the company carries itself professionally.
This is a share market, not the horse races. SLR is never going to achieve a market cap to compete with the big players unless it acts like the big players (the vast majority of which pay regular dividends)