Exactly, I agree with you. Why will Leverkusen put such amount on Wirtz when there's no guarantee that he will be in form through out his contract. I feel they don't want to sell him and that's why they're putting such huge price tag on him. Lookman is a sharp and strong attacker and he would fit in on that position. No need of wasting funds when there's a good alternative.
Next season will be much more difficult for Leverkusen because Xabi Alonso's departure to Real Madrid could have a significant impact and some of the players who leave will also be quite problematic to fit into the squad. Leverkusen's management needs to prepare for all possibilities that will happen so that there is no way other than to maximize their strengths. Wirtz could leave because there are many offers coming to him, especially since Xabi Alonso is also quite interested in bringing him to Real Madrid besides Bayern Munich who want him and Ademola Lookman could be an alternative if they fail to recruit Wirtz.