I'm fairly certain we all know that it's worthwhile keeping our makeup brushes clean. For a lot of people, cleaning their (often vast) brush collection is a bit of chore, one of those tasks you know you need to do but the thought of it fills you with dread.
I'm just going to throw it out there and admit, I'm not one of those people. I don't find it a chore, I actually enjoy the ritual of a good brush cleaning session. I know, I need to get out more.
The benefits of cleaning your kit far outweigh the drawbacks (in fact, are there any drawbacks?!) Decent makeup brushes don't come cheap, they're an investment and that warrants due care and attention in my book. If your brushes are clean, your makeup goes on so much better, the bristles feel more comfortable against your skin, you're avoiding transferring bacteria and nasties from product to brush to skin and back...see, there are no drawbacks.