Has anyone done this?

I have been thinking of returning to work part-time, but as DP is against daycare I could only work on his days off which would take away our family time (DP is a chef so works 9am-10/11pm). So working is out, but browsing the local paper today I noticed a walkers wanted add "earn up to $300/wk for 8-14hrs" and thought maybe that could bring in the little extra a week that would help immensely.

Sounds too good to be true lol. Is it easy? Money not worth the effort you have to put in? I am wary of calling about it, it just seems like if it was so easy wouldnt everyone be doing it lol