At the risk of sounding like a wet rag, as a long-time collector I steer waaay clear of these so-called “special sets”, particularly the ones hawked on TV and in magazines. Most of the selling price is for the holders and any other accompanying materials rather than in the coins. There is a small niche of collectors who may buy a complete, well-presented set but in general there’s not a big secondary market. In some cases they can make interesting displays or conversation pieces, but they’re not a good investment.