I have always used the same E-mail address everywhere, for conveniance really, and never had a problem. Well I have two, one for UK and one for US sites.
It is an E-mail address I use just for gambling sign ups anyway, so I dont care if it gets sold or sent Spam.
If bookies correlated data at all (and they dont) it would not be by E-mail addresses (which is very very easy to change) it would be residential address. But they dont anyway. And I dont think you mean "abuser", accepting and taking part in an offer is not "abusing" it. The term "bonus abuse" was made up by the gambling firms themselves, and refers to taking part in multiple offers you are not entitled too. You are doing nothing wrong and have nothing to hide so there is really no need to try.