It is widely known that producers have been able to make 1000's of dollars selling beats online via SoundClick. Sure, a fresh pair of ears could be very useful, but it is unrealistic to expect to drop $50-100 (or more) every single time you need a master a track, especially when you're just starting out. Studios and recording engineers are largely fans of xxvii good artist and love being on the inside of the creative process.
Today's most successful producers have a sound knowledge on multiple levels and topics of music production and therefore allows them to communicate and collaborate with musicians and engineers from different musical backgrounds, even if they are not masters of a specific field.
When it comes to humanizing synthesized sounds , prepare to fail more times than you succeed. Roy Wilkenfeld's Electronic Music book is an interesting read for anyone who wants to know about the ins and outs of mixing your own sound. One of the best ways to learn about producing music is to collaborate with other producers.
In the church where I attend service regularly, we recently purchased a mixer- basically to mix sound quality, but no one is well equipped to do the right mixing. Not only is this a much more enjoyable process in its entirety for all parties involved, it also ensures that live artists sound like their recordings.
But when you're half way into the song, and there's no sense of organization, you'll have a hard time finishing the track to the end. The space that it adds can be very helpful, but sloppy reverb sounds can often become smeared over the mix, reducing clarity.
Arrange your environment before you start - Before you sit down and start to mix a track it is important to get everything arms reach and make sure you have everything needed out and close to hand. Many producers chase after a sound that already exists. Be conscious of what other frequencies are already occupied, and use the tools at your disposal to fill the gaps as well as clearing out the middle of the mix for your bass and kick (and vocal, if it's a vocal track).