usually bans on first login occur because of bad proxies, sometimes reason is bad quality of accs, though it's unlikely that you will get one like that. When we receive multiple complaints about any type of acc we usually stop selling it untill we find out what's wrong.
back in 2013 there were almost no limits/filters on Instagram, so it was pretty easy to create those accs without need of changing different parameters such as deviceID/googleadsID etc. - I guess this would be main technical difference between them
follow/like limits differs since people doing different stuff, CPA is always riskier than other type of monetization, but from over 1k of 2013 accounts sold I had only one guy who had 1(one) account blocked. 8month accs are way more popular among our clients, but I guess the price is the reason