Honestly, I don't obsess about the fee like some.
Most of the best players we have seen play in the last 15/20 years have not been expensive and a lot of the expensive ones have been shite.
For me it is all about fit for the system and can they cut it in the prem.
Solanke ticks both of those boxes.... I don't particularly want to spend time for a striker to adjust to the pace and physicality of the league and whilst Dovbyk had a great season, who knows how long it will take him to get going here.