Some food for thought:
For those who don't know, Kodansha's
MagaPocket mobile app has all WSM series from digital release (so no Ippo) available for free after a 3 week delay, and the app allows each user to "favorite" the series to keep a personal bookmark.
The number of favorites each series gets is publicly shown, so I tried ranking the "Favorites" count as of January 13th.
MagaPocket Favorites Ranking (Jan. 13, 2018)
- Kanojo, Okarishimasu (51366)
- Dometic na Kanojo (44247)
- Seishun Soukanzu (39451)
- Gotoubun no Hanayome (35906)
- Daiya no Ace Act II (31463)
- Days (26746)
- Mako-san wa Shindemo Jiritsu Shinai (19423)
- Real Account (18962)
- Runway de Waratte (18615)
- Fuuka (17730)
- Tokyo卍Revengers (17672)
- Kishuku Gakkou no Juliet (16816)
- Hoshino, Me wo Tsubutte (16467)
- Tsurezure Children (11319)
- Seitokai Yakuindomo (11096)
- Senryuu Shoujo (10980)
- Fire Force (8482)
- Sensei, Sukidesu (7913)
- Nanatsu no Taizai (6334)
- Fumetsu no Anata e (6107)
- Ahiru no Sora (6023)
- Tsue Petit Mahou Tsukai (5686)
- Eito Carnival (4585)
Numbers for some of the older, completed series:
- Baby Steps (19906)
- World End Crusaders (13004)
- Kami-sama no Iutoori (10079)
- Yamada-kun (9625)
- Area no Kishi (6896)
- Kessen no Kuon (6062)
Series that moved to MagaPocket from WSM and are still on-going.
- Infection (49171)
- Ranker's High (35316)
Do note that there is a bit of a recency bias, in that series that started after the app launched (~2.5 years) tend to pick up readers better, and they can be influenced by the kind of promotions that happen within the app. I do have a small theory that the recent romance push is somewhat influenced by their desire to promote the app, but that's a story for some other time.