Alt-coins have been around for years, almost all of them are dead, and none of them have more than 25 merchants. They have almost no active development. It's really hard to get merchants to accept them; they just tell people to convert to bitcoin. Litecoin already has 18m coins mined and in the hands of very few people. Only people who don't understand the
network effect invest in it, and if it was easy for them, they would probably also put money into WeBidz thinking that because it has lower fees, it is superior and will overtake ebay or be "silver to ebay's gold". Bitcoin will outperform alt-coins because its rate of growth is so much higher.
"Investing in LTC as an alternative to BTC is like using gasoline soaked cash that you keep piled up in your house as a hedge so you can rebuild if your house is destroyed in a fire" --
DeathAndTaxes 
