One might say Gowron fought this little war not in order to win, but in order to secure his back domestically. Going to war against the UFP gives him war leader status and silences some of his opponents. And going to war with troops spearheaded by poorly armed and trained members of Houses that are Gowron's political opponents allows him to purge his ranks... The undesirables are expended, but they serve to pave the way for a second, more successful wave where warriors from the ranks of Gowron's allies gain great glory.
However, we also have to factor in that "Martok" the Founder goaded Gowron to attack the station under false assumptions about its defensive capabilities. When it became evident that the station indeed was resisting, Gowron might have done wisely to send in expendable scouting parties first, and only commit his capable warriors later, quite regardless of whether he wanted the scouts dead for political reasons or not.