I'm not sure of the motivation for daily corporate worship, either. If we're talking about merely a pragmatic thing, wherein we say "it would be nice to gather together to worship God daily - isn't that a good thing to do?", then we have to examine our motivations more closely.
I'm going to go out on a limb here and also note that the people of God, from what we know in Scripture, did not make a daily practice of corporate worship. Furthermore, not only do we not see any narrative descriptions of daily corporate worship, but also it should be noted that it is not commanded. And therefore, since it is not commanded...
I think I must respectfully disagree. We are commanded to gather and worship. We are not told how often or when. If we should deem it either necessary/prudent/or fruitful to do so every day or only on the Lord's Day, we are still faithfully executing the command. Are we to say that the apostolic church was disobedient to scripture by gathering on more than just the Lord's Day?
Yes, our motivations are always to be examined: and what would the motivation of this be? To worship God together. How is that a bad motivation?
As a side point, lots of Reformers went along with the practice of daily morning and evening prayer services, including the cities of Geneva and Strasbourg.
Some Pros:
1.) Allows more pastoral contact and accountability than exclusive family worship.
2.) Allows the body to assemble more and grow in love toward one another (always a good thing).
3.)
It is especially beneficial for those who live alone, I might observe, who don't have the luxury of the daily family worship.
4.) It has precedent in the apostolic church. We
do see them gathering together frequently (daily, actually).
I personally think it's a great thing and wish it happened again more often in protestant churches. This is not to replace family worship, but to augment and supplement it, and I think we should make use of it.