*inhale* Each custom picutre icon would have to be reviewed, and it would take a lot of people to get through everyone. Considered as well, you would have to find people mature enough for the task, and almost nobody would be willing to do it for free. Let's say there's 10 people, and there's 50 people who make custom picture icons per hour. You pay all 10 people $15 an hour, and that's already $150. In consideration there would be people changing their icons to custom picture ones all around the clock. Let's say that month had 30 days in it. That would add up to around $10,800.
Now lets say that we didn't review custom picture icons, but had a report feature. With around 13 reports of inappropriate profile icons per hour. You would pay maybe 5 or 6 people for the job. That's $75 or $90 per hour. Now take into consideration that it's 24 hours in a day, and (for that month) 30 days. $3,600 or $4,320. Now to take into consideration that they would have to have people for bans as well. Let's say 5 more people take that job. $3,600 more dollars, making a total of $7,200 or $8,640 per month spent on custom picture icons.
Either way, you're spending over $7000 per month on custom picture icons, and hiring a lot of workers. Now, I'm not including raises because of how difficult and unpredictable they are to calculate. And the process of hiring workers who are willing to work for a small meme website is difficult.