Pirin hasn't really been residents only since it opened. IMO Pirin is a better managed resort. During the build, the golf course was falling apart as they were using local gypsies to build it without any proffessional supervision. Apparently the Woosnam Design team stepped in and insisted they employed a Proffessional Team to build and run it.
Last year there were monthly tournaments that non-members were invited to and they've carried on with the offers this year,prices were around 25 Euro and 40 Euro if you wanted a Golf Cart Golf Cart. They also try to offer prefferential rates for accomodation there with the non-resident membership offers.
It's worth joining their 'mailing list'(theres a link top right of the web page). That way you get mailed any new offers before they are posted online and you can also register for the offer via email.
Out of all the new Golf Resorts, I think Pirin is the most non-member/resident friendly. I'm hoping the new Pravets Golf Resort will be run in a similar manner as I've heard the Management there are experienced in the Golf 'business'