This is not a helpful question, because there is no decision you can make which depends on the answer.
Here's a better question: "I have about 2000 signups and 3-4% of them are active users. What can I do to improve my activation or retention?"
Here are some ideas:
1) Do you email people? This is the single most effective way to increase retention, because email is stickier than applications for pretty much every application which is not Facebook. If you don't email people, email people. An easy way to test the waters is to get a MailChimp account and set up an "autoresponder" sequence with emails 1 day into use and 1 week into use.
2) Have you optimized your first run experience? You get about 30 seconds before that pernicious bastard, the Back button, eats your lunch. Make that thirty seconds count. If ~5% of people currently hitting the back button had a good first experience and stayed for the long haul, you'd have about twice as many active users.
P.S. There are worthwhile things you can do for the business which will decrease your percentage of users who activate. That is OK.