Thank you, simond!
Now it's time for an update.
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A few days ago I decided to keep records of each of my videos' position for my main keywords. As for what I've been doing in the last couple of days, all I can say is that I've been gathering points on YLH (found a bot, which works quite acceptable, although I'm not anywhere near >1k per hour), EV (been thinking about using their Youtube Featuring option, but I'm currently reconsidering that, given what has happened to Twixx), Vagex and SYV.
In addition, I've made an original video in a totally new niche, right from scratch, and now I'm struggling to get it past page #5. But we'll see how it goes.
Anyway, here are my statistics for the past 3 days:
02/19/2013 - $4.54
02/20/2013 - $1.70
02/21/2013 - $7.71
I won't go in-depth with the details, but here's a screenshot with # of impressions, clicks and downloads.

As you can see, yesterday was probably my best day so far, even if my earnings weren't at their peak.
Current video positions:
- Video #1 - Page 2, position 5 (
13,400 results) - 12.5k views
- Video #2 - Page 2, position 3 (
529 results) - 16.3k views
- Video #3 - Page 2, position 10 (
4,490 results) - 1.6k views
- Video #4 - Page 7, position 11 (
13,800 results) - 3,7k views
- Video #5 - not indexed yet (?) - 400 views
- Video #6 - not indexed yet (?) - 300 views
+ Video #7 - Page 6, position 9 (
9,420 results) - 250 views
What I'm going to do next:
- Add realistic comments to videos #4, #6 and #7
- Upload 2 more videos, one for each niche. I'm not going to attend new niches, I'll just pick the top two, the ones which brang me the most income.