Stay away from them. Its a trap! Or else you'll be like me. Once I went down that slippery path, I then felt compelled to collect sheets right up to today. Very expensive and I'm still not sure I did the right thing. At least I am sticking to my guns and refuse to collect the imperforates. (Another slippery path designed specifically for the stamp collector.)
Except for a few issues, there is not much value to modern US stamps other than the value as postage. If a dealer is going to buy sheets from you, you'll probably receive about 40-50% of face value. The dealer will then sell the stamps at about 70% of face value to collectors.
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