Egypt is really great, we were there a couple years ago and yea I can confirm they are rather aggressive to sell you stuff but it's competitive for them I guess and that's how they have to earn their food.
A weird thing that happened to us in Cairo was that they would let you get on the camel and then ask for money to give the camel the command to let you off :)
Also, for people visiting there: don't let people that look like policeman or wear army uniforms etc take a pic of you with your camera. They offer to do it but they're normal people dressed like that and will ask for money to return the camera after taking the picture.
It is the way they make their living, true. However, you as a tourist feel like prey to hunters and they certainly had a very negative influence on the sightseeing experience. I find this very sad, I actually only came there to enjoy that incredible monuments. But they just won't let you alone, it's a pity.