Hi Mike,
First question first, of course you should research it further,the more information you have the better to decide if it is for you or not.
Second question- probably not,and that is because profit is not all there is to it.
Some of us run quite new trucks, and some are a lot older. The older may cost more to run and need replacing sooner rather than later. Anyone can have a good year with no breakdowns etc and that would make that years profit look good but a couple of weeks into the next year blow an engine and have a five or six grand bill!!!
Third question- For anybody starting out a good workhorse that fits your budget.
Hopefully there will be a time when the topliners and globetrotters etc will be within that budget 
There could be some of the others that have a different view though, thats the beauty of it we all have different ideas.
cheers
STEVE.