The risk here is that although there might be 3 free seats at check-in, unless the check-in agent actually blocks the seats (which they can still do, but very rarely will) you've got absolutely no guarantee that one or even both of the seats next to you won't be taken after you've checked in - especially if there are people standing by.
Originally Posted by
jtet
But this whole conversation has me wondering: If I buy two or three seats, do I get credit for 2x or 3x the PQM and segments? What about RDM? Does the spend beyond a single seat count towards PQD?
Answered in
How to buy an extra seat? "EXTRASEAT" for paid or award flights - basically RDM and PQD, but not PQM.