I am not much of a sports gambler. However, many sites seem to have deposit bonuses. Depending on the requirements for clearing the bonuses, is there a risk-free way to make money on sports-betting?
For example, let's say you deposited at 5 sites, each that had a 20% bonus where you had to wager 5x that amount first. If you signed up at 6 different sites - you would have $600 in bonuses.
If you placed a $500 wager on one team on one site, and against that team on the other site - it seems like you would make a minimum of $150. Further, if you could find spreads that were off by a 1/2 point or full point - perhaps you could even get lucky and win $650 or $1150 sometimes. Has anyone tried this? Am I missing something?

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