You'ld have to ask the person who sold Russia (dot) com for 1.5 million not so long ago if they made any money. (sales like that do not happen every day) There is lots of good advice in this forum that is worth reading before going hog wild on buying domains. Welcome aboard and hope you have success.
Yes, if you invest intelligently, you can make money reselling domain names.. you don't even have to buy names, you can make money brokering names for others.