The answer straightforwardly is NO. Buying an email database does not afford you success. For one, the list may not be targeted. You would be liable for spamming those on the list, thereby diminishing your efforts and potentially leaving you liable for privacy violations and flagging your email service for illegal activity. Instead, you should collect and invest in building your mailing lists via different sanctioned processes such as a solicitation module on your website, reservation confirmation emails, etc.