If you have an individual II membership, not a corp one paid for by a developer, you can let it lapse and then sign up again. II does indicate that they can charge a reinstatement fee or something like that but I've never heard of anyone having to pay it. If you let your membership expire you can still log in to your account and just go to the membership section and pay a new fee to renew. As long as you don't tell them you've sold a timeshare they don't know any different and will let you continue to be a member. the only exception to this is if you own a timeshare where your II membership is included, like enrolled Marriott or Vistana or Vistana VSN membership. If you sell those, the developer stops paying your annual membership fee and you lose access.