Here's another article uncritically repeating a common cluster of false assumptions

The article:

https://www.karger.com/Article/FullText/355205

The false assumptions: 

"1. Assumption: All or most OA journals charge author-side fees.

False: 70% of peer-reviewed OA journals charge no author-side fees. About 50% of articles published in OA journals are published in the no-fee variety.

http://bit.ly/oa-book#p170

2. Assumption: All or most subscription journals avoid charging author-side fees.

False: 75% of subscription journals do charge author-side fees, not as APCs but as page and color charges.

My number is from a 2005 ALPSP study. I'd gladly update it, but I haven't seen more recent data.

http://www.alpsp.org/write/MediaUploads/FAOAoverviewREV.pdf

3. Assumption: Fee-based journals don't erect editorial firewalls to protect against corruption. (Among other things, an editorial firewall insures that peer-review editors don't know whether a given author would pay a fee or receive a fee waiver.)

Hasty: Some do and some don't erect editorial firewalls. Unfortunately,  I don't think anyone has published data on the ratio.

4. Assumption: If the possibility of fee-based corruption casts suspicion on the integrity of fee-based journals, then it would cast suspicion on more OA journals than non-OA journals.

False: On the contrary, if we assume no editorial firewalls at fee-based journals, then this business model would cast suspicion on 75% of non-OA journals and only 30% of OA journals (or 50% of OA journal articles)...."