Yes, I do believe there is room for one sided arrangements other than sympathy.
HOWEVER, as far as roses are concerned, it depends.
I worked for a shop in OKC years ago. 1995 to 1997 to be exact. This shop did roses all around most of the year, at valentines day they did them one sided.
And they got complaint after complaint at valentines day. It wasn't my store, I wasn't the manager, I just did what I was told, but I could see that that was bad business.
To me it was the equivalent of buying BIG MAC'S at McDonald's. they always have
"two all beef patties, special sauce, lettuce, cheese, pickles, onions on a sesame seed bun." There top bun, then cheese, then pattie, then bun, then cheese, then pattie then bun and the lettuce and pickle and what not also in there. Then one week a year they stack all the buns together, then both slices of cheese, then both the patties, and the lettuce and onions and pickles and the special sauce in a big glob.
Yes, all the ingredients are there, just not the way you like it.
Valentines day is not the time to change your game. Hopefully hundreds of people see your dozen rose arrangement and are impressed so they use you more often.