Well..if you're going to leave it on the street..then I'd have to ask, "..where do you live?"
You can't sell it locally? When you sell, if shipping is a must, then shipping is always extra..on top of the sale price. Sell it for $500, then shipping will be about $150 extra(i.e. you get $650)..unless you sell it on ebay, in which case you'll get appreciably less after ebay fees.
No tune up is mandatory..if it runs ok and just needs some adjustment, then a sale on craigslist (facebook..etc) only involves a free ad and an appointment with a buyer to pick it up. The buyer will be responsible for tuning up, lube, cleaning, new tires/tubes...etc... If a tuneup is desired prior to the sale, then it'll run $75-ish, parts would be extra.
If you think saving the frame, fork, BB, headset... is desirable..and cheaper(???)..you may want to price out what a 105 or above component groupset runs$ (today..it won't be any cheaper in the future,
https://www.merlincycles.com/en-us/r...oupsets-75294/) along with a set of wheels and tires/tubes(near $100 for tires/tubes and $300+ for wheels.. for basic good stuff, easily $500+ if you want nicer stuff). It sounds like you'd have to buy parts new and have them installed. My local bike shop wanted $600 to build a set of wheels. I got much nicer wheels for far less money (on sale) online..but you need to know what to buy & where..you probaby won't have that advantage, if/when the time comes.
I think you're following false economy. There's probably a 50% chance you'll never ride again..which supports the case of sell it and move one. If you do want to ride in the future, a complete, near new, used bike of the style you're interested in at some future point, will be far cheaper than have a shop build up an old bike with new parts. I have a number of near-showroom condition bikes (Lemonds) that were purchased for 30-35 cents on the dollar relative to their cost when new. There's tons a very nice bikes available today that will be on the used market in the future...take your pick..
With respect to your overall premise..been there, done that, life is more simple if you face up to the fact that your interests change through life..sell it and move on. If/when you ride again..when you're older, you'll be looking for a more comfortable ride..gravel bike-ish with 38mm tires. Been there, done that too. I have road bikes running 28mm tires(as that's about as big as they'll take)..fun bikes, I love riding them on certain routes. I enjoy having the option to ride them on fast day rides. However, the bike that gets the most miles, as it's a do-everything pretty well bike, is a Poprad with 38mm tires. Fast, fun, and cushy ride..if I had just one bike..this may be the one..or two..or three.