Why does Alexa suck now?

[Vanquished]

So I know Alexa was always an estimate. But recently (since they updated and basically went to a paid service). My site has dropped significantly in the rankings. Peaking in the low 90ks it has dropped to 130k over the last couple months. Interestingly enough each week/month is more trafficked than the previous. So my site is growing in visitors and pageviews but Alexa keeps dropping. I know it's quite a meaningless metric but it irks me that it thinks my site is in decline when its exactly the opposite. Anyone else have any experience with this annoyance?