Funding doesn't make a lot of sense to first time Founders. In our minds, we think, "Hey, investors want to make money, so if my startup can make money, who cares how big it gets?"
Unfortunately, that thinking overlooks one big fact: that for every one investor check out there, there are hundreds of startups competing for it.
In order to understand how investors look at one deal versus another, we first have to understand how investors look at deals in the first place.
There's no absolute rule here, but investor behavior generally follows a consistent trend. Most "professional" investors (people who invest consistently) gravitate toward investments that can yield an exponential return, such as an IPO.