+1 Light Action components that you have are relatively low end, but are nice performers. As you consider upgrades, cost will exceed what a similar bike with those componwents already on it. So at that point, you are ahead just selling it and buying another bike.
Until then, you have a nice bike. Enjoy it!
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Please don't confuse ebay "asking" prices with "selling" prices. Many sellers never get their ask price. some are far from it. Value is determined once an item actually SELLS. Its easy enough to check SOLD prices.