sportsbook software is set up to let the clerks and customer service staff see only what they need to see to do their job. Most of the delicate financial info. is only available to the accountants, administrators, owners, etc.... CC companies obviously protect the clients judging by the chargeback rate and e-check is just like giving a check to someone at the mall. If you trust some store clerk at the mall with a check whats the difference (Your address, phone number, account number, routing number etc.... is on the check).
IP´s are always logged when you log into your account so there is really no way someone from Costa Rica or any other country can log into your account and request a withdrawal. Where would they send the money? Even if they did get through all the hassle the sportsbook would obviously refund your account and kill the ex employee if someone did manage to take money out, which would be 1,000,000 to 1 chance.
Your money is safe as long as you play with reputable companies that actually have accounting departments, wagering departments, management and betting floors not to mention there are cameras all over the place at most sportsbooks and all computers are monitored with software developed to register everything the clerk does. These companies are divided for an obvious reason. If you are using a sportsbook and you get the same 3 people everytime you call I would be cautious and not keep all your eggs in one basket.........
FI