Yes, getting a win from Real Madrid certainly triggers their spirit to increase many times over, they should not be easily satisfied and make this as one of the whips so that the players are more consistent and strong in every match, not only in the UCL, but also in the EPL. This is still a challenge for Arteta to make his players much stronger.
Moreover, with all this, Arsenal's income is much bigger, and this will make the team's finances even better. Yes, of course, at least they will be much freer for the transfer market later, even though Arsenal does not seem to have any problems related to finances.
Source: Arsenal have earned £88million so far in the Champions League this season.About the picture above, is it suppose to be a motivation to the players? Arsenal need to focus and forget about money this money that because this money talk has been what the management have been using the players to get but forget to help them write their names on any trophy. The Gunners need every available player to push their way to the champions league final and Madrid shouldn't be a barrier, the second leg is a must win and they also need to score more goals.
Putting every single game as important like you said will make other teams see the Gunners as a team with so much hunger to get any trophy they are fighting for and I said it that winning Madrid is not the end but the beginning and if they continue fighting back any team that comes their way, Liverpool on their own might slip for them (Arsenal) to top and is now or never for the Gunners to sit up, the title race is widely open and money shouldn't be their first or second target but winning both titles (Champions League and the Premier League Title).