That is negotiable - at the minimum, I would offer to split it.
When an owner is giving away a timeshare with no value, they often sweeten the pot by paying for the transfer fees.
IMPORTANT: The buyer may offer to do the transfer themselves - don't agree to that - it gives the buyer complete control of the transaction, and that is not in your best interest. You want to choose a reputable title company that will make sure things are done legally, AND the can spot a scam or any irregularities.
When they don't want to use a 3rd party title company - it's also one sign of a possible scam.
Even if the buyer is completely honest - that doesn't mean they know what they are doing, and they could accidentally screw up the title transfer and cost you a lot more than $150.
*As I stated previously, I once has a seller send me the deed to their home instead of the deed to their timeshare.