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Welcome to IIS Rob.
Your 4" Royal Astro is a classic - I owned a 3" F16 Royal refractor of the same era and they were a well made scope for the time. Unfortunately time has passed and most modern scopes will exceed their performance by a considerable margin. For example an ED 80 would show just as much as your 4" with much better definition.
The 4" may be worth a small amount to a collector - but there are very few of these. In fact, I think you may struggle to sell this scope at all, so do not be afraid of mounting it on a tripod. Perhaps you could build the tripod yourself.
Other than that I recommend you move to the modern world and buy an ED or Apo refractor - or a 6" or 8" Dob and really see what the universe has to offer using modern 1.25" eyepieces.
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