It all depends on the marketing, branding and unique offer you put behind your product... there's quite a bit out there in regards to pop-up companies, and even more softwares that now build this type of solution into their CRMs.
So again, take it with a grain of salt that there are a lot of other competitors.. it shows competition + the market size.
NOTE: If you don't have $5,000 to make this work, I'd look into a lot of other niches where you can make A LOT of money online. Especially email marketing..