We'll see. I think Newcastle are very desperate, when you consider what relegation means to their 'project'. There aren't a huge number of proven premier league attacking forwards that would either choose to go there right now or be made available by clubs with their own ambitions at this stage of the season.
Sure, Newcastle can spend 15m on a player from outside the league, but will the acclimatise in a few weeks? No club near Newcastle are going to sell players to them (Burnley aside apparently). The big six have their own demands, and lots of games coming up.
For the sake of 5m, I'm happy for us to try and show we're not the mugs this time around. Newcastle want him, they can afford him. So pony up.