I don't have any skin in the game so please allow me to give a word of warning as I have some insight on this.
The purity of yohimbe/yohimbine/rauwolscine containing products on the market vary considerably.
A paper which tested commercially available products found a huge discrepancy between the doses some products claimed and the dose actually contained within the product;
"Of the 11 supplement brands that did provide the quantity of yohimbine on the label, many were inaccurately labeled (actual content ranged from 23% to
147% of the labelled content). Prior studies have also found yohimbine supplements to contain from 0% to 368% of the labeled quantity of yohimbine"
http://onlinelibrary.wiley.com/doi/10.1002/dta.1849/full
If you dive into the table they provide, at least one product claimed to contain rauwolfia vomitoria (minimum 90% extract) yet none was detected in the product.
Target-A2 was an extremely long project for us especially for a single ingredient product. We tested a lot (I mean, a lot lol) of sources and time after time they came back with different results to what was claimed. Due to the prevalence of this, we also tested some commercial products and consistently found discrepancies.
Making an educated guess based on experience, there is a high possibility that people believe they are consuming rauwolscine when in reality they aren't at all.