A custom guitar is a very different beast from a brand name when it comes to resale. Part of the problem is name recognition. Everyone knows Martin, Taylor and Gibson. How many even know Bourgeois or Lowden or Froggy Bottom, names common on this forum? Even with those great reputations, the market is limited to those in-the-know. Everybody wants you to think that whatever they're selling is custom or special. So unless the name is known by the potential buyer it's a near impossible sale. There isn't enough marketing depth so the buyer pool is limited.
But then if you're in the right marketing pool perhaps a custom build might keep pretty good value. But the bottom line is what someone is willing and able to pay.
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Assuming is not knowing. Knowing is NOT the same as understanding. There is a difference between compassion and wisdom, however compassion cannot supplant wisdom, and wisdom can not occur without understanding. facts don't care about your feelings and FEELINGS ALONE MAKE FOR TERRIBLE, often irreversible DECISIONS 
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