Guitar manufacturers from time to time offer limited edition copies of the stars guitars which by their very nature are highly desirable. Some collectors buy the guitars and never play them, while others use them every day.
As the number of these guitars produced is very low, they become much sought after and are looked at as a long term investment. Recently there have also been collections of "art" guitars by various manufacturers such as Fender with the TIKI models, Gretsch with the Americana collection and Martin with the Felix the Cat limited models.
A limited edition guitar will not usually be at the budget end of the market, but in time will only increase in value.