Recruiting Database: Build it or Buy It?

Over the years, contact database technology has changed, especially with so many off-the-shelf options out there. In the early-mid 1980s and 1990s had most search firms building their own systems - at a huge cost. Today, build-your-own is a more viable option with prices coming down in both categories thanks to competition and access to talented developers. My question to you is, "Build or Buy - and why?"