I agree that the price of membership is probably not the best use of your money now -- particularly not the price of the yearly renewal.
But the option that BCgradnurse suggested of paying the fee once to put the line on your resume is worth considering. Some day, you may be in a situation where you would want to re-activate your membership, go to local chapter meetings, apply for a small grant or scholarship
, etc. The fee might be worth it to keep those options open for the future -- just the minimum induction fee, not the added one for the ceremony.
If you are ever asked why you did not maintain your membership after you were inducted, I would tell the truth. Just say you could not afford the yearly fee to maintain it, but were honored by the invitation to join.