The Egypt international has hit 30 goals in all competitions for Liverpool since joining for an initial £36.9million fee last June.
Anfield chiefs struck the deal for Salah weeks before transfer prices skyrocketed thanks to Neymar’s £200m world-record move to Paris Saint-Germain from Barcelona.
Roma negotiated a series of add-ons with Liverpool for Salah but he still looks to be one of the bargain buys of the season.
Monchi said: “At the end of the day, we could reach €50m with bonuses, but at that moment we had to sell and that was an important option.
“The Neymar and Kylian Mbappe transfers changed the market, but at that moment it was necessary that we sell.
“I still think the price could’ve been better for Salah, but it did give us the possibility of making other moves.
“When I arrived, the Liverpool offer for Salah was 32m euros plus 3m euros in bonuses. In today’s football, players go wherever they want to.
“The figures are important, because at the end of the day we are a business, but the fans cannot be bought.
“In my years at Sevilla, people counted the trophies and those are so far missing at Roma.
“I understand the fans perfectly well, I know they don’t want to talk about numbers, they just want to win, but that is my job.
“We have to build a club that doesn’t just win, but does so consistently over time. Fans don’t want promises, they want results.
“I accept all of that, but ask them for a little faith. It takes time. We’ve got to stay quiet and work harder to find the right path towards what the fans want.”
Salah struck his 30th goal of the campaign in Liverpool’s 5-0 win at Porto in the first leg of their Champions League last-16 tie last night.
Sadio Mane bagged a hat-trick while Roberto Firmino was also on target as Jurgen Klopp’s side all-but secured their place in the quarter-final stage.