As a low roller, football season only bettor, should I bother sticking to one site?

[BradyFreeMoney]

If I only deposit $500 every year for NFL/College and make $20 bets and cash out at the end of the season, is it worth it to stick to Bovada and slowly grow my account?

Or should I just sign up to a new site every year and get a 50% or 100% signup bonus?

Thanks in advance.