Do many people have good results from domains with one extra letter?

[sumosalesman]

Hi everyone,

I'm trying to start low low with some small-time flips and possible site developments... I bought an ebook that, while costing money of course, actually had a lot of sound strategies and resource material (this of course before I learned I could learn practically anything I needed to here free XD )
And it's one of these strategies I'm interested in trying out.

Do many of you have good results from selling domains with one extra character, like vchicken.com or jpowertools.com?

[Acro]

For short, positive, action words it works - even if it's not an "e" or an "i".
E.g. (random examples) xforum, cworld, utube etc.

[draggar]

Nope not at all.

Not gmail.com. Nope, these are worthless.

esurance.com (OK, that one has a letter replaced).

ireport.com

Nope. Sorry, worthless.

(Note: sarcasm in the post).

These can have a lot of potential if developed and marketed properly. I would be very careful with i, though. I think Apple is a bit proactive with UDRPs.