If you were in the pizza business, rather than in the stockmarket business, how much would you be prepared to pay for the domain name pizza.com ? An interesting question at the moment, as pizza.com is up for sale by auction - the price at the moment is $602,000 (Friday morning) and the reserve hasn't been met yet -
For an investor, investing in domain names is potentially very lucrative, the only problem is that all the 'good' .com names were sold long ago, so now in order to get one you have to be prepared to dig deep, as for pizza.com. You can sometimes find others which have not yet risen by so much, but then you have to find one that the owner is prepared to sell. Or you can buy cheaper extensions such as .net or relatively new extensions such as .in which may rise dramatically in the future as India extends its Internet footprint.